/**
 * @author: 子龙
 */
package reflectDemo;


import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @Author 12629
 * @Description：
 */
public class Test {

    public static void reflectNewInstance() {
        try {
            Class<?> c1 = Class.forName("reflectdemo.Student");

            Student student = (Student)c1.newInstance();

            System.out.println(student);


        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    public static void reflectPrivateConstructor() {
        try {
            Class<?> c1 = Class.forName("reflectdemo.Student");
            Constructor<Student> constructor =
                    (Constructor<Student>)c1.getDeclaredConstructor(String.class,int.class);
            constructor.setAccessible(true);

            Student student = constructor.newInstance("zhangsan",19);
            System.out.println(student);
        } catch (ClassNotFoundException | NoSuchMethodException | InstantiationException | IllegalAccessException |
                 InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    public static void reflectPrivateField() {
        try {
            Class<?> c1 = Class.forName("reflectdemo.Student");
            Field field = c1.getDeclaredField("name");
            field.setAccessible(true);

            Student student = (Student)c1.newInstance();

            field.set(student,"poll");

            System.out.println(student);

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (NoSuchFieldException e) {
            throw new RuntimeException(e);
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    public static void reflectPrivateMethod() {
        try {
            Class<?> c1 = Class.forName("reflectdemo.Student");
            Method method = c1.getDeclaredMethod("function",String.class);
            method.setAccessible(true);

            Student student = (Student)c1.newInstance();
            method.invoke(student,"我是一个参数....");

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        //reflectNewInstance();
        //reflectPrivateConstructor();
        //reflectPrivateField();
        reflectPrivateMethod();
    }


    public static void main1(String[] args) {
        try {
            Class<?> c1 = Class.forName("reflectdemo.Student");

            Class c2 = Student.class;

            Student student = new Student();
            Class<?> c3 = student.getClass();

            //class对象只有一个
            System.out.println(c1.equals(c2));
            System.out.println(c1.equals(c3));
            System.out.println(c2.equals(c3));

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
    }
}

